Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2ffb489c92c6b69…

MALICIOUS

PDF

72.8 KB Created: 2021-10-01 00:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a8d08468d0785ec82b9556d2da726956 SHA-1: a92f334c51988ceab753657a71d9439116096ade SHA-256: f2ffb489c92c6b69a47a6d0fc775ca4e599926c37c7fe36987f3d71e16d7e0f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to potentially malicious or disposable domains. The document body is heavily obfuscated, preventing a clear understanding of its direct lure, but the overall structure and URL distribution strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://wastran.ru/uplcv?utm_term=app+android+ahorrar+bateria PDF link annotation
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/161562611521bc---situzawalixejafiwij.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/tukefanetilusolur.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/65947635170.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/padizafiwopegav.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/takuvuzawusenixadajumeki.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/wesimeberuxedusegemaja.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/76008632706.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/momagakujibef.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/74404405833.pdfIn PDF document text
    • https://cecprint.com/images/file/64719284714.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/16325851446.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/99428022302.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/jizipilimuropupata.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/47382152937.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/gofezitekakubumifosek.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/54204189662.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16152c0704c5b3---kulira.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/78223596154.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/sozenogogota.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/xomimodokosis.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/96526786289.pdfIn PDF document text
    • http://weingut-suppan.at/files/71863973520.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21E 17136 bytes
SHA-256: fe04264e3f7ddf2da3f9ba09daee824b6f9f3a95ca7bf5eef11ce967b8000c4a
font_02_sfnt_off0000fe90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE90 10396 bytes
SHA-256: a708db60a29b690a6f441baa9ad8f4ea88de3d6310092b7850bd3fa37ce74cc4

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